BOTANICAL, RE;SEARCH — MACDOUGAI,. 1 35 



The constant temperature chamber was made by digging an excavation 

 6 by 6 feet, to a depth of 9 feet, in the rock in the center of the physical 

 laboratory. This was walled with an air-space all around with brick and 

 arranged with a heading so that the chamber can be entered without creating 

 disturbing air-currents. The top of this chamber is insulated by planking and 

 tarred paper. The bulb of a Hallock thermograph is suspended in the 

 chamber, the recorder of which stands in the Laboratory above, so that a 

 continuous record is obtained. In addition to the constant temperatures 

 a" perfect dark-room is also formed, which will be of the greatest usefulness 

 in several investigations. Similar thermographs are employed in keeping a 

 continuous record of the soil. 



A small instrument shelter is in position a few feet to the westward of the 

 Laboratory in which is placed a set of thermometers, thermographs, hygro- 

 scopes, etc., the data obtained from such sources being referred to in many 

 of the researches carried on at the Laboratory. 



Rainwater Reservoir. — For the ordinary operations of the Laboratory and 

 for cultures of plants rainwater is necessary. To meet this need the entire 

 laboratory was properly guttered and leaders were joined in a system which 

 led to a small stone reservoir which was built in the line of the southern side 

 of the quadrangle. Supply pipes from this reservoir were run to the physical 

 and chemical Laboratories and to the small greenhouse. 



Water System. — It was found necessary to reorganize the entire water 

 supply of the Laboratory, as the old service was inadequate and the machinery 

 faulty. To meet these conditions a lot was purchased in McKee's addition in 

 the valley of the Santa Cruz and a well driven in it by contract. A pump 

 was installed and a new line of i^-inch dipped pipe was laid to the labora- 

 tory site, 7,000 feet distant and 400 feet above the well. Here a new stone 

 reservoir, lined with brick, has been constructed with a capacity of 6,000 

 gallons. The lowest point in this reservoir has a head of 35 feet above the 

 roof of the Laboratory, and it is believed provides an adequate supply for 

 use, as well as for fire protection. 



Miscellaneous. — A small building near the Laboratory furnishes quarters 

 for an attendant, but should be replaced by one of fireproof construction. A 

 public-comfort station was also built of stone near the main laboratory. 



The equipment embraces two series of cold frames for cultural work, one 

 of which has been put in place in the quadrangle, while the other is kept in a 

 knock-down condition in order that it may be readily moved to any part of the 

 reservation as occasion arises in the experimental work. 



The alpine and austral plantations may be reached only by trails, and all 

 material must be carried by pack animals. To meet this need a complete 

 pack equipment has been organized, which comprises two pairs of heavy 

 rawhide kyacks suitable for the transportation of instruments without dam- 

 age. In addition, a fairly adequate camping outfit for mountain work has 

 been provided. 



